1. Ancient Rocks Reveal Earth's Magnetic Field Existed 3.7 Billion Years Ago ScienceAlert
  2. 3.7 Billion Years Old: Oldest Undisputed Evidence of Earth's Magnetic Field Uncovered in Greenland SciTechDaily
  3. Geologists discover rocks with the oldest evidence yet of Earth's magnetic field MIT News



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Ancient Rocks Reveal Earth's Magnetic Field Existed 3>7 Billion Years Ago - ScienceAl